High school student Suzui Kyoka is completely devoted to her idol "oshi-katsu," the passionate activity of supporting her favorite performers. Concerts and fan events fill her heart with joy, but they leave her stomach empty. After a live show, she stops at a restaurant and orders a hearty bowl of katsudon. The meal satisfies her hunger in a way that pure idol worship never could, and she realizes that food can be its own kind of "oshi." This discovery launches her into a new form of oshi-katsu: hunting down delicious "oshi-meshi" — personal favorite meals that nourish both body and spirit.

Kyoka embarks on a series of culinary adventures, sampling a wide range of dishes and discovering the joy of eating out alone. Along the way, she encounters a cast of friends and fellow food enthusiasts, including the characters Yume, Ranko, and Rin, each of whom introduces her to new flavors and perspectives on food. The story balances her ongoing idol fandom with her growing passion for gastronomy, and each chapter highlights a different dish that becomes a temporary or lasting favorite.

As the series progresses, Kyoka's journey takes an emotional turn when she faces the crisis of potentially losing one of her beloved "oshi." This challenge tests her resilience and forces her to reconsider what it means to support something she loves. The manga concludes with her navigating this personal trial while continuing to explore the vast, satisfying world of oshi-meshi, ultimately finding that both idols and food offer their own unique forms of fulfillment. The narrative is a lighthearted gourmet comedy that celebrates the simple pleasure of a truly satisfying meal.